WWTP Lemay WWTP

Saint Louis · official identifier CWNS2022_29001023002

350MGD reported design flow (2022) · 10th of 15,772

EPA Clean Watersheds Needs Survey 2022 · official identifier CWNS2022_29001023002 · reported size 350 MGD reported design flow · reported treatment: Advanced · data year 2022. 10th of 15,772 records with reported size in the inventory of United States; 0.70 % of the sum of those 15,772 records in MGD (sum of records, not national capacity); nearest inventoried plant at 5.5 km · 1 within 10 km. Reported data with their source; estimates are not measurements of the plant.

Aguas SB does not manage this wastewater treatment plant.

WHAT THE DATA REPORT

Reported data official data · 2022

350MGD reported design flow

10th of 15,772by reported size among the 15,772 records with a size in the inventory · 0.70 % of the sum of those records (sum of records, not national capacity) · the largest plants in the country · how it is calculated

Treatment	Advanced · reported levels
Reported coordinates	38.5327, -90.2709 precision reported by the source: 4 m what it means
Source and year	EPA Clean Watersheds Needs Survey 2022 · dataset record

FUENTES PÚBLICAS

What public sources report

Population of the served area (Instalación CWNS 29001023002): 453,428 inhabitants (2022, U.S. Environmental Protection Agency (EPA)).

Documented milestones

1968 · The Lemay treatment plant began operating with primary clarification. Instituto Nacional de Seguridad y Salud Ocupacional de EE. UU.
1985 · The Lemay treatment plant added secondary clarification. Instituto Nacional de Seguridad y Salud Ocupacional de EE. UU.

Facts taken from public documents, with their date and link; an authorisation, a project or a planned capacity do not prove operation or quantities actually treated. Aguas SB editorial layer, lot L02; it does not change the official data.

REGULATORY REFERENCES

Referencia normativa: United States

Regulatory framework of United States. Individual applicability is not determined in this profile.

LOCATION

Missouri: this plant on the map

this plant on the map · regional directory.

NEARBY PLANTS

Nearby wastewater treatment plants

Plant	Distance	MGD reported design flow	Treatment
DUPO SEWAGE WORKS	5.5 km	0.6	Secondary
COLUMBIA STP · Columbia · CWNS2022_17003313001	10.3 km	1.47	Advanced
SAUGET - AMERICAN BOTTOMS REG. STP	11.0 km	27	Advanced
MDC Powder Valley Nature Center WWTP	13.9 km	< 0.01	Advanced
Saline Creek Regional WWTF	14.7 km	5.25	Advanced

Distances are between reported coordinates; proximity does not establish a hydraulic connection.

QUESTIONS

Frequently asked questions about this plant

What capacity does WWTP Lemay WWTP report?

Reported size: 350 MGD reported design flow. Units are retained without conversion.

What treatment is reported?

Treatment Advanced. Nitrogen, phosphorus and UV are shown only when explicitly reported.

SOURCE AND CORRECTIONS

Source

reported data · EPA Clean Watersheds Needs Survey 2022 · data 2022 · edition 2022 · source licence: Public domain (EPA geospatial default; see LICENCIA.txt) · JSON for this plant · suggest a correction · catalogue 2026-11-06. Reported data, not a current inspection; no compliance judgements.